Comprehensive processing method for waste through production of phthalic anhydride

Abstract

The invention discloses a comprehensive processing method for waste through production of phthalic anhydride. The phthalic anhydride is produced by employing an air gas phase oxidation process, the waste comprises waste silica-gel spheres generated from a dehydration sublimation process of a production system, industrial exhaust gas discharged from a trap at an end of a production system, and organic waste water generated during hydrolysis of phthalic anhydride; and the processing method comprises the following steps: 1) waste silica-gel sphere processing; 2) tail gas recovery; 3) organic waste water processing; and 4) waste liquid processing. The comprehensive processing method for waste through production of phthalic anhydride can process and recover all wastes in a solid state, a liquid state or a gas state generated during production of phthalic anhydride, and the wastes enable reasonable recovery and utilization, no secondary refuse is generated, and the comprehensive processing method has the advantages of simple process, high enforceability, low energy consumption, and excellent comprehensive properties.

Description

technical field [0001] The invention relates to the technical field of pyromellitic dianhydride preparation, in particular to a comprehensive treatment method for pyromellitic dianhydride production waste. Background technique [0002] Pyromellitic dianhydride (referred to as homoanhydride) is an important chemical raw material with a wide range of uses [1,2]. Homoanhydride polyimide has excellent electrical insulation and mechanical properties, and is an essential material for aviation, aerospace, electronics, and electrical industries. Its derivatives play an important role in the fields of coatings, plasticizers, adhesives, scale removers, and preservatives. [0003] The production of homoanhydride mainly adopts durene gas-phase air oxidation reaction technology, and its production process is mainly divided into the following four processes: (1) oxidation process, (2) capture process, (3) hydrolysis decolorization process and (4) ) dehydration sublimation process, durin...

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Problems solved by technology

[0003] The production of homoanhydride mainly adopts durene gas-phase air oxidation reaction technology, and its production process is mainly divided into the following four processes: (1) oxidation process, (2) capture process, (3) hydrolysis decolorization process and (4) ) dehydration sublimation process, during this process, will produce waste silica gel balls after decolorization treatment, reaction tail gas and a large amount of high-concentration organic wastewater produced during hydrolysis of homoanhydride. waste and cause serious environmental pollution